The 100-day mark signals the start of some serious training. If you’ve run the Boston Marathon, you know that the training is grueling—especially in the dead of winter when the last thing you want to do is feel the icy sting of cold air on your face while you try to get those miles in. Lucky for marathoners in the city, the Trackhouse, running company Tracksmith’s retail store and community center for runners, will be hosting free long runs every Sunday leading up to the race. These long runs are in addition to the Trackhouse’s weekly Tuesday/Thursday workouts at 6:30 p.m. and will include four course preview runs on the Marathon route. So now you 1.) don’t have to suffer through the cold alone and 2.) can make corrections and modifications to your training as you go.

Each run will feature route options of varying distances, pre-run coffee and snacks, and access to lockers. There will also be coaches on-site to give you feedback and to bounce training questions off of, along with pace groups and support stations stocked with water and gels along each route. You’ll also get to enjoy a post-run breakfast in the Eliot lounge and will have access to the Trackhouse’s recovery room complete with foam rollers, stretch bands, and more. You can also request an appointment with a physical therapist if you need a little fine-tuning. On days when the run takes place from a different point on the course, a free bus service will be provided.

And these runs aren’t just exclusive to Boston Marathoners, although you’d be remiss not to take advantage of them if you’re running in April. Any runner or marathoner can join in, whether or not you have a race coming up.

The Trackhouse opens at 8 a.m. on Sundays for runners to meet up and all long runs begin at 9 a.m. On course preview days, the bus departs at 8:30 a.m. for a 9 a.m. start. The first long run took place January 6, and the rest of the schedule is as follows:

January 13: Out and back half marathon on the marathon course from the TrackhouseJanuary 20: Beacon and Commonwealth Ave. January 27: Charles River February 3: Beacon and Commonwealth Ave.February 10: Bus to WellesleyFebruary 17: Out and back half marathon on the marathon course from the TrackhouseFebruary 24: Bus to Natick
March 3: Charles RiverMarch 10: Bus to FraminghamMarch 17: Out and back half marathon on the marathon course from the TrackhouseMarch 24: Bus to AshlandMarch 31: Beacon and Commonwealth Ave.April 7: Charles RiverApril 14: ShakeoutApril 15: RACE DAY!

Fore more information and to RSVP (space is limited on buses): tracksmith.com.